The patch titled
Subject: mm/madvise: add MADV_WILLNEED to process_madvise()
has been added to the -mm tree. Its filename is
mm-madvise-add-madv_willneed-to-process_madvise.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-madvise-add-madv_willneed-to-process_madvise.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-madvise-add-madv_willneed-to-process_madvise.patch
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------------------------------------------------------
From: zhangkui <zhangkui@xxxxxxxx>
Subject: mm/madvise: add MADV_WILLNEED to process_madvise()
There is a usecase in Android that an app process's memory is swapped out
by process_madvise() with MADV_PAGEOUT, such as the memory is swapped to
zram or a backing device. When the process is scheduled to running, like
switch to foreground, multiple page faults may cause the app dropped
frames.
To reduce the problem, SMS can read-ahead memory of the process
immediately when the app switches to forground. Calling process_madvise()
with MADV_WILLNEED can meet this need.
Link: https://lkml.kernel.org/r/20210804082010.12482-1-zhangkui@xxxxxxxx
Signed-off-by: zhangkui <zhangkui@xxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/madvise.c | 1 +
1 file changed, 1 insertion(+)
--- a/mm/madvise.c~mm-madvise-add-madv_willneed-to-process_madvise
+++ a/mm/madvise.c
@@ -1048,6 +1048,7 @@ process_madvise_behavior_valid(int behav
switch (behavior) {
case MADV_COLD:
case MADV_PAGEOUT:
+ case MADV_WILLNEED:
return true;
default:
return false;
_
Patches currently in -mm which might be from zhangkui@xxxxxxxx are
mm-madvise-add-madv_willneed-to-process_madvise.patch
